US3357358A - Hydraulic piston pumps - Google Patents

Hydraulic piston pumps Download PDF

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Publication number
US3357358A
US3357358A US501575A US50157565A US3357358A US 3357358 A US3357358 A US 3357358A US 501575 A US501575 A US 501575A US 50157565 A US50157565 A US 50157565A US 3357358 A US3357358 A US 3357358A
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US
United States
Prior art keywords
ring member
eccentric
annular members
cam surfaces
pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US501575A
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English (en)
Inventor
Rateau Alexis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3357358A publication Critical patent/US3357358A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0413—Cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
    • F04B49/123—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/06—Control
    • F04B1/07—Control by varying the relative eccentricity between two members, e.g. a cam and a drive shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009—Special features
    • F04B43/0036—Special features the flexible member being formed as an O-ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/06—Control
    • F04B1/08—Control regulated by delivery pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams
    • Y10T74/2102—Adjustable

Definitions

  • the hydraulic piston pump according to the present invention which comprises a number of cylinders disposed radially at spaced angular intervals about a rotary shaft provided with an eccentric member controlling the reciprocating movements of the pistons slidably mounted in said radial cylinders, is characterized in that it comprises means such that the throw of said eccentric member decreases gradually and automatically as the pressure exerted by said pistons on the fluid contained in said cylinders increases, said throw possibly becoming zero when said pressure attains a predetermined maximum value.
  • the thrust is transmitted from said eccentric member to the piston push members by means of an intermediate ring member surrounding with a certain play said eccentric member, said ring member comprising on each one of its two lateral or end faces frustoconical inclined cam surfaces adapted to co-act with frustoconical cam surfaces of opposite inclination formed respectively on the registering inner faces of two annular members surrounding said eccentric member and concentric thereto, dis posed on either side of said ring member, and resilient means constantly urging said annular members towards each other in order to return said ring member to its maximum throw position, said ring member being adapted, by pushing said annular members outwards through the medium of the pressure exerted on the co-a-cting inclined cam surfaces, to resume more or less reduced eccentric positions, down to zero throw.
  • the resilient means constantly urging said two annular members for adjusting the throw of said intermediate ring member may consist of dished spring washers interposed between said annular members and external abutment members.
  • a thrust ring may be mounted on the intermediate ring member, between this ring member and the piston push members, needle bearings being interposed between these two ring members.
  • the eccentric member revolves with the minimum clearance in a cylindrical chamber fed from the reservoir or fluid return line of the hydraulic motor driven from the pump and supplying the pump cylinders through delivery pipe lines or ducts disposed tangentially, said chamber thus constituting in conjunction with said eccentric member a rotary pump of which the efficiency adds itself to that of the piston pump.
  • FIGURE 1 is a longitudinal axial section showing the assembly with the ring members in their initial maximumthrow position
  • FIGURE 2 is a view similar to FIGURE 1 but showing the ring members in their zero-throw position;
  • FIGURE 3 is a cross-sectional view taken upon the line III-4H of FIGURE 1.
  • the pump illustrated in the drawing comprises a cylindrical pump body 1 formed with integral radial cylinders 2, 3 and 4, and a pair of flanges 5, 6 through which extends the drive shaft 7 carried by needle bearings 8 and 9; between these two bearings the shaft 7 comprises an eccentric port-ion divided into two end bearing portions 10 and 11 of relatively large diameter and a central portion 12 of smaller diameter, the difference in diameter between these lateral and central portions corresponding to twice the throw e.
  • the intermediate ring member 13 is mounted concen trically to these eccentric portions 10 to 12 but have no direct contact with the central portion 12 of the eccentric; the ring member 13 is formed with frustoconical lateral inclined cam surfaces 14 and 15 engaging corresponding cam frustoconical surfaces 16 and 17 of opposite inclination formed on the two inner registering surfaces of a pair of lateral annular members 18 and 19 respectively, mounted on said eccentric lateral portions 10 and 11; besides, spring dished washers 2t and 21 bear with their outer faces respectively on a shoulder 22 or shaft 7 and on a ring 23, and with their inner faces against said lateral annular members 18 and 19; these spring washers exert their resilient pressure in the direction of the arrows f and of FIGURE 1 to keep the intermediate ring member 13 in the maximum throw or eccentric position shown at e in this figure.
  • a thrust ring 24 carried by said intermediate ring member 13 through the intermediary of needle bearings 25 and 26 transmits the reciprocating thrusts resulting from the rotation of the eccentric portions 111 to 12 to the push members 27 of said three radial cylinders 2 to 4, and also to pads 28 of adequate elastomer, the elastic deformat-ion of these pads modifying the volumetric capacity of the inner chambers 29 of cylinders 2 to 4, thus determining the pump operation.
  • a hydraulic piston pump comprising a rotary shaft having an eccentric portion, a plurality of radial cylinders disposed at spaced angular intervals about said eccentric portion of said rotary shaft, an intermediate ring member surrounding with a certain clearance said eccentric portion and controlling the reciprocatin-g movements of the pistons slidably mounted in said radial cylinders, said ring member having formed on each one of its two end faces frustoconical cam surfaces adapted to co-act with frustoconical cam surfaces of opposite inclination formed respectively on the registering inner faces of two annular members surrounding said eccentric and concentric thereto, said annular members being disposed on either side of said ring member, and resilient means constantly urging said annular members towards each other to return said ring member to its maximum eccentric position, said ring member being adapted, by pushing said annular members outwards through the medium of the pressure exerted on the co-acting inclined cam surfaces, to resume more or less reduced eccentric positions, down to zero throw.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
US501575A 1965-01-18 1965-10-22 Hydraulic piston pumps Expired - Lifetime US3357358A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2321A FR1431741A (fr) 1965-01-18 1965-01-18 Pompe hydraulique à pistons fournissant à vitesse de rotation constante un débit variable, fonction du couple résistant

Publications (1)

Publication Number Publication Date
US3357358A true US3357358A (en) 1967-12-12

Family

ID=8568534

Family Applications (1)

Application Number Title Priority Date Filing Date
US501575A Expired - Lifetime US3357358A (en) 1965-01-18 1965-10-22 Hydraulic piston pumps

Country Status (8)

Country Link
US (1) US3357358A (es)
BE (1) BE674993A (es)
CH (1) CH438034A (es)
DE (1) DE1528524A1 (es)
FR (1) FR1431741A (es)
GB (1) GB1081069A (es)
NL (1) NL6600661A (es)
SE (1) SE309159B (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4177773A (en) * 1977-12-27 1979-12-11 Cribbs John R Damped automatic variable valve timing device for internal combustion engines
US20160327038A1 (en) * 2015-05-08 2016-11-10 Danfoss Power Solutions Gmbh & Co. Ohg Fluid working systems

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19632606A1 (de) * 1996-08-13 1998-02-19 Kaercher Gmbh & Co Alfred Verdrängerpumpe, insbesondere für Hochdruckreinigungsgeräte

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1122124A (en) * 1914-02-14 1914-12-22 Peter Johnsen Fuel-charging and charge-forming apparatus for internal-combustion engines.
US2263786A (en) * 1938-08-12 1941-11-25 Jr Emile T Rumpp Pump
US2327787A (en) * 1942-01-05 1943-08-24 Jack & Heintz Inc Variable displacement pump
US2393175A (en) * 1944-10-13 1946-01-15 Benjamin G Laskey Pump
US2871846A (en) * 1955-12-27 1959-02-03 Gen Motors Corp Pump
US2913991A (en) * 1956-01-26 1959-11-24 Gen Motors Corp Pump
US2974599A (en) * 1956-01-26 1961-03-14 Gen Motors Corp Pump
US3043228A (en) * 1958-02-20 1962-07-10 Norton K Liquid pump
US3073178A (en) * 1959-03-13 1963-01-15 Gen Motors Corp Adjustable eccentric drive devices
US3270684A (en) * 1962-12-11 1966-09-06 Pasquali Jean Piston machine

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1122124A (en) * 1914-02-14 1914-12-22 Peter Johnsen Fuel-charging and charge-forming apparatus for internal-combustion engines.
US2263786A (en) * 1938-08-12 1941-11-25 Jr Emile T Rumpp Pump
US2327787A (en) * 1942-01-05 1943-08-24 Jack & Heintz Inc Variable displacement pump
US2393175A (en) * 1944-10-13 1946-01-15 Benjamin G Laskey Pump
US2871846A (en) * 1955-12-27 1959-02-03 Gen Motors Corp Pump
US2913991A (en) * 1956-01-26 1959-11-24 Gen Motors Corp Pump
US2974599A (en) * 1956-01-26 1961-03-14 Gen Motors Corp Pump
US3043228A (en) * 1958-02-20 1962-07-10 Norton K Liquid pump
US3073178A (en) * 1959-03-13 1963-01-15 Gen Motors Corp Adjustable eccentric drive devices
US3270684A (en) * 1962-12-11 1966-09-06 Pasquali Jean Piston machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4177773A (en) * 1977-12-27 1979-12-11 Cribbs John R Damped automatic variable valve timing device for internal combustion engines
US20160327038A1 (en) * 2015-05-08 2016-11-10 Danfoss Power Solutions Gmbh & Co. Ohg Fluid working systems
US11499552B2 (en) 2015-05-08 2022-11-15 Danfoss Power Solutions Gmbh & Co. Ohg Fluid working systems
US11655816B2 (en) * 2015-05-08 2023-05-23 Danfoss Power Solutions Gmbh & Co. Ohg Fluid working systems

Also Published As

Publication number Publication date
DE1528524A1 (de) 1970-07-09
CH438034A (fr) 1967-06-15
SE309159B (es) 1969-03-10
NL6600661A (es) 1966-07-19
FR1431741A (fr) 1966-03-18
GB1081069A (en) 1967-08-31
BE674993A (es) 1966-05-03

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